If you are stuck on Baleful then you most likely wont have access to Elemental +2. You can get Water Attack +2 though in its place. To be honest you may want to just shoot for Normal S Boost and normal shot him down. Not a huge gunner in Ultimate yet but thats what I would do. That or clust him to death, he is so close to the ground that the bomblets will all hit and do tons of damage to him.

Combination Pro is a very useful skill. Solo, you’re able to have more than enough ammo with mats left over in some cases. I use it on a Pellet set which can make from 1-3 shots. With Combo Pro, making 3 shots is extremely better than making one at a time. Extra ammo is always nice.

Hmm... I don't see much of an issue with that set you are bringing materials to combine for shots though right? Also what is your guns raw damage and can it be further upgraded and if it can what do you need to upgrade it? Sorry for all these questions but I want to give you the best advice with guns with the information give to me.